Add ClassReflection->is() shortcut

src/Reflection/ClassReflection.php

@@ -639,6 +639,11 @@ public function isAnonymous(): bool
 		return $this->anonymousFilename !== null;
 	}
 
+	public function is(string $className): bool
+	{
+		return $this->getName() === $className || $this->isSubclassOf($className);
+	}
+
 	public function isSubclassOf(string $className): bool
 	{
 		if (isset($this->subclasses[$className])) {

tests/PHPStan/Reflection/ClassReflectionTest.php

@@ -28,7 +28,9 @@
 use NestedTraits\BazTrait;
 use NestedTraits\NoTrait;
 use PHPStan\Testing\PHPStanTestCase;
+use PHPStan\Testing\RuleTestCase;
 use PHPStan\Type\IntegerType;
+use PHPUnit\Framework\TestCase;
 use ReflectionClass;
 use WrongClassConstantFile\SecuredRouter;
 use function array_map;
@@ -307,4 +309,17 @@ public function testBackedEnumType(): void
 		$this->assertInstanceOf(IntegerType::class, $enum->getBackedEnumType());
 	}
 
+	public function testIs(): void
+	{
+		$className = get_class($this);
+
+		$reflectionProvider = $this->createReflectionProvider();
+		$classReflection = $reflectionProvider->getClass($className);
+
+		$this->assertTrue($classReflection->is($className));
+		$this->assertTrue($classReflection->is(PHPStanTestCase::class));
+		$this->assertTrue($classReflection->is(TestCase::class));
+		$this->assertFalse($classReflection->is(RuleTestCase::class));
+	}
+
 }